Seedream 4.5
Image Available Full comparison ↗ bytedance/seedream-4-5 · by ByteDance Seed
· Diffusion transformer (DiT)
Pricing — 1 offering(s)
About this offering: ByteDance's successor to Seedream 4.0, released in December 2025, with stronger typography and dense-text rendering and more consistent multi-image editing, by ByteDance's own account. BytePlus still sells it alongside the newer Seedream 5.0 models.
Default
- $0.04 / image
Current
2026-07-22 → present
One flat price per output image at any resolution. Reference (input) images are free, and images blocked by…
One flat price per output image at any resolution. Reference (input) images are free, and images blocked by content moderation aren't billed (BytePlus ModelArk pricing page, checked 2026-10-11).
Showing the active price and any recorded history. Full pricing history is available via the paid API — see API docs.
See how Seedream 4.5 fits into a cost-aware routing setup
See how →Capability profile
How Seedream 4.5 rates across core capability dimensions, with the task-level evidence behind each rating.
ByteDance's own page claims it 'further enhances the typography and dense text rendering capabilities' relative to 4.0, which was already rated strong on this dimension.
ByteDance's own page: 'accurately identifies the main subjects in multi-image editing' and 'strictly preserves the details of the reference images' — a specific multi-reference consistency claim, not generic marketing.
ByteDance's own MagicBench evaluation claims 'significant improvement' over 4.0 specifically in prompt adherence and alignment — a vendor-run benchmark comparison, not independently verified, but a specific claim rather than generic marketing language.
No specific maximum resolution stated on ByteDance's own Seedream 4.5 page or BytePlus's ModelArk docs for this model, unlike 4.0's explicitly-stated 4K ceiling — not assumed to carry over without confirmation.
ByteDance hasn't published a speed figure for Seedream 4.5, so speed is unrated.
Ratings are estimated — limited independent data is available for this model.
Operator guidance
Seedream 4.5 is the newer model, with stronger typography and multi-image editing by ByteDance's account, at $0.04 vs Seedream 4.0's $0.03 per image. On overall preference, though, Artificial Analysis's text-to-image arena ranks 4.0 slightly ahead (#23, Elo 1031, vs 4.5 at #27, Elo 1023) and Gemini 3 Pro Image well ahead (#13, Elo 1102), checked 2026-10-11. Choose 4.5 for text-heavy or multi-reference editing work, and test 4.0 when price or general image quality matters more.
Use cases
- In-image text, formula, and dense-text rendering, improved over 4.0
- Multi-reference-image editing where consistency of reference-image details matters
- Direct successor to 4.0 for the same unified generation+editing workflow
Limitations
- Resolution ceiling, inference speed, photorealism, and artistic range are unrated — no vendor-primary claim found distinct from generic marketing or unattributed secondary press
- ByteDance's MagicBench comparisons with Seedream 4.0 are vendor-run, with no independent confirmation